number-sense

phet.colorado.edu

Play with counting and cardinality. Compare representations, including word, numeral, ten frame, and objects. Hear the number spoken aloud in two different languages. Challenge yourself to subitize numbers up to ten!

phet.colorado.edu

Explore size estimation in one, two and three dimensions! Multiple levels of difficulty allow for progressive skill improvement.

phet.colorado.edu

Compare numbers represented as numerals, objects, groups, and ten frames. Use a sentence, number line, or stacked units to determine the larger group. Hear the comparison spoken aloud in two different languages.